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Property and Equipment. | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT. |
5. | PROPERTY AND EQUIPMENT.
Property and equipment consisted of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Facilities and plant equipment |  | $ | 357,740 |  |  | $ | 495,513 |
Land |  |  | 4,837 |  |  |  | 7,219 |
Other equipment, vehicles and furniture |  |  | 7,858 |  |  |  | 11,229 |
Construction in progress |  |  | 11,828 |  |  |  | 15,793 |
|  |  | 382,263 |  |  |  | 529,754 |
Accumulated depreciation |  |  | (152,777 | ) |  |  | (197,228 | )
|  | $ | 229,486 |  |  | $ | 332,526 |
Depreciation expense was $30,268,000 and $40,931,000 for the years ended December 31, 2020 and 2019, respectively. For the years ended December 31, 2020 and 2019, the Company capitalized interest of $224,000 and $563,000, respectively, related to its capital investment activities.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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